Just tried unplugging it. Makes no difference starting or trying it both ways running.
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Did you fix the EGR wiring? The 0411 controls the EGR valve in a different manner and a new 12V supply wire has to be run back to the PCM from the valve to the corresponding pin on the PCM. If not the valve will hang fully open. Easy way to check to see if it is the problem is to merely unplug the valve.
The problem is more with the 0411, the valves 12 volt source is the 0411. I believe the PWM signal is oddly controlled by the PCM on the positive side. If the valves 12 volt source is not connected to the PCM, it opens wide open. Unplugging it keeps the valve closed, which is why I suggested it as a diagnostic test.From this description (attached, GM Service Manual), it appears like the EGR works like this, using a five (5) terminal connector:
- Power (+12) is applied on Terminal E from IGN to power the pintle's solenoid ("motor"); however, the solenoid doesn't just cause motion by itself; rather, it in combination with the PWM signal applied by the ECU causes the pintle to move. Without +12, the solenoid ("motor") won't operate and the pintle will remain at rest.
- PWM signal from the ECU is applied on Terminal A; the duty cycle of this signal determines the position of the pintle, and changing the duty cycle changes the pintle's position... provided +12V power is applied to Terminal E as well.
- GND for the solenoid ("motor") is through the EGR valve's case it appears
Feedback to the ECU comes from a pintle position sensor, as follows:
- Sensor GND is Terminal B (wired to the ECU's GND reference)
- Sensor +5 is on Terminal D (this likely is supplied by the ECU)
- Senor output is on Terminal C (this is the signal back to the ECU which indicates the position of the pintle).
the valves 12 volt source is the 0411.
Throw the 98 service manual out of the window with an 0411.The GM Service manual seems to say something different. It specifically mentions "Ignition" as the +12V source, but perhaps that's an artifact. It also makes a confusing statement about the solenoid current passing through the ECU.
Without +12V power, and based on the GM Service manual description, I can't see how the pintle would open.
Just going by what I've read. My Suburban's sitting outside, I could go experiment...
My buddy and his friend did the wiring on his 0411 swap ignoring the EGR step. Acted exactly how this guys truck does.
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Throw the 98 service manual out of the window with an 0411.
The EGR valve will stay closed unless exhaust backpressure blows it open. Pull the valve out. The pintle is rather easy to move with your finger. I have seen a Bank 1 cat that started plugging up force the EGR valve wide open. I have also seen the egr pintle spring become weak or break and the EGR valve partially opens at idle or off-idle or opens much more quickly than the PCM is commanding.
Below is the EGR wiring diagram using an 0411. The EGR is controlled on the positive side with an 0411 and the negative side on an older black box. If you do not run the positive wire to the correct pin on the 0411, the EGR recieves a constant 12 volts and the valve fully opens.You must be registered for see images attach